Bicycle frame



FIG. 1 is a side elevational view of a bicycle frame showing our new design the opposite side being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a greatly enlarged fragmentary sectional view taken along lines -3 of FIG. 1;

FIG. 4 is a greatly enlarged sectional view taken along lines 4--4 of FIG. 1; and

FIG. 5 is an enlarged fragmentary sectional view taken along lines 5--5 of FIG. 1. 

The ornamental design for a bicycle frame, substantially as shown. 